The full name of polystyrene foam board, also known as EPS foam board or plate. xps Extrusion plate. Polystyrene board (2) is a polystyrene beads containing a volatile liquid blowing agent, upon heating advance thermoformed white solid having a fine closed cell structure in the mold. Form, as we buy furniture inside shockproof polyurethane foam insulation board advantages: effective thermal insulation due to the thermal conductivity of polyurethane blowing agent is much lower than that of air (good insulation properties), so the insulation performance of rigid polyurethane foam is better than those containing only air materials such as: mineral wool, fiberglass and polystyrene.